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UNITED STATES PATENT FFlcEs ISAAC T. DYER, OF CHICAGO, ILLINOIS,ASSIGNOR OF TWO-THIRDS TO PETER FISH AND OSCAR FITZ CLIFFORD, BOTH OFSAME PLACE.

COMPOSITION FOR COATlNG IRON AND WOOD.

SPECIFICATION forming part of Letters Patent No. 425,412, dated April15, 1890.

Application filed October 13, 1888. Renewed July 26, 1889- Serialll'm3l8fl30. (Specimens) To all whom it may concern:

Be it known that 1, Isaac T. DYER, a citizen of the United States, and aresident of Chicago, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Composition for Coating Iron andWood, of which the following is a specification, reference being had tothe ingredients composing the coating and the method of compounding themand applying the same for use, as-hereinat'ter fully set forth.

First, the purpose of this invention is to coat iron and other metals,so that salts, acids,

' or alkalies will not come in contact with their surfaces, by simpleand comparatively inexpensive means; second, to render wood imperviousto moisture and to acids and alkalies. This I accomplish by acomposition made of asphaltum, lamp-black, sulphur, and lard-oil or alike oleaginous substance.

It has been the custom to coat pipes made of metal and to coat wood withasphaltum and to use lamp-black as an ingredient of paint; but a coatingmade of the ingredients named is original with me, and was not knownbefore my invention thereof. Asphaltum employed alone as a coating istoo porous to exelude water for a great length of time-that is, so thicka coat of asphaltum on a pipe as to exclude water is impracticable, andfor excluding salt-s, acids, and alkalies such a coat as can beconveniently applied is of no prac tical use.

I make a coating which serves well the purpose of resisting these Isubstances by filling the pores of the asphaltum with lamp-black andfinely-ground sulphur. The medium employed to accomplish this islard-oil as the cheapest and best. I take five pounds of solidasphaltnm, melted in a suitable vessel, and bring it to a heat less thanthat which will produce combustion, add one quart of lard-oil and alsoadd one-halt pound of sulphur and onehalf pound of lamp-black andincorporate the same by stirring the mass thoroughly and adding lard-oilto keep the compound about the consistence of thick paint. This must bedone where there is free ventilation, or a suction-fan must be. operatedover the mixing-tank to carry off the fumes of sulphur, which at firstare disagreeable; but they soon pass off as the mixingprogresses. Thecomposition should then stand for four to six hours, and is afterwardsuitable for use.

In practice a large tank of the composition can be prepared at a timeand the metal or wood in a heated state can be immersed therein, or thecomposition in a heated condition less than 'to produce combustion canbe applied in any of the Well-known ways for coating pipes or surfacesof iron and wood. By heating the material to be coated to a degree'lessthan to produce combustion of the composition a much better protectionwill be 6 5 attained. I I

From time to'time during the heating and stirring process it will benecessary to test the composition to find if all those portions of theoil which will not form a chemical 7o union with the other ingredientshave been eliminated. This can be done by applying some of the mass to awarm iron and letting it cool. Then if the coat is hard and firm thecomposition is fit for use. Otherwise the heating and stirring processshould be 0011- tinu ed till the composition will be hard when cool.

The composition thus prepared can be kept in a plastic form in tightcasks and shipped to any desired place for use.

I claim as new and desire to secure by Letters Patent of the UnitedStates A composition for coating metal and wood, consisting ofasphaltum, sulphur, lamp-black, 8 5 and lard-oil, compoundedsubstantially in the grolportions given, and for the purpose specj-ISAAC T. DYER.

Witn csscs:

G. L. OHAPIN, PETER FIsH.

